Midi files to hardware arranger

I connected the Cubase 5 and my arranger Roland BK9 via USB cable. Midi in and Midi out working properly.
Roland is installed as External instrument in VST system.

I want to load standard midi files in Cubase and send him via MIdi to Roland because i want to hear internal sounds from Roland, not from HalionOne in Cubase.
This means, Cubase should be only the trigger of Roland internal sounds. I want to send from Cubase all 16 channels at same time that i could hear a complete midi file.
Please, explain me, What i do to set-up in Cubase for this (step by step)
Thanks !